114 MGD; Michigan, –21.5% to 204 MGD; Virginia, –15.3%
to 71 MGD; and New Mexico, –15.3% to 211 MGD.
Based upon various federal government sources, it is esti-
mated some 38.9% of the nation's population in 2010 de-
pended upon groundwater for its drinking water source when
accounting for groundwater use for drinking water from pub-
lic supply systems and from individual household water well
systems used by occupied households.
2
Previous estimates
had put the percentage at closer to 44% in 2005.
GROUNDWATER USE
from page 29
waterwelljournal.com
30 March 2015 WWJ
WWJ
Kevin McCray, CAE, is the chief executive officer of the
National Ground Water Association. He has been the CEO
since 1995 and also serves as the chief executive of
the National Ground Water Research and Educational
Foundation. He can be reached at kmccray@ngwa.org.
2
Only about 82% of rural households in America are occupied, ac-
cording to the Census. For our estimate, we have used this same per-
centage. We subtracted 18% of the total estimated rural resident
population of the United States to get the occupied household popu-
lation. We used the American Housing Survey's estimated 13,093,000
occupied households on wells in 2011. We divided the total occupied
rura
l households population by the number of occupied households
on wells to come up with a per household average number of people.
We
multiplied that average by the number of occupied household
wells to come up with an estimate of the U.S. population actively
using household wells' groundwater. The population for community
water systems comes from the U.S. EPA's 2010 Factoids document.
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